Land Resources of Auvergne Station
A supplement to the Land Resources of the Victoria River District
Napier, Diane; Edmeades, Bart; Lynch, Brian; McGregor, Robert; Northern Territory. Department of Environment and Natural Resources
E-Publications; E-Books; PublicationNT; Jul-18
Auvergne Station; NT Portion 2676; Victoria River Downs; Victoria River District
This report for Auvergne Station is a supplement to Land Resources of the Victoria River District (2012) and completes the land resource assessment of the district which covers 24 properties and approximately 78 760 km² of pastoral land. Land unit mapping at 1:100 000 describes the landforms, soils and vegetation in the district.
Made available via the Publications (Legal Deposit) Act 2004 (NT)
Table of contents; 1. Introduction; 2. Previous mapping; 3. Survey methodology and data collection; 4. Lithology; 5. Landform; 6. Soil; 7. Soil physical and chemical characteristics; 8. Vegetation; 9. Land evaluation; 10. Soil erosion; 11. Land unit descriptions; 12. References; Appendices 1 - 12.
Soils -- Northern Territory -- Auvergne Station; Land use -- Northern Territory -- Auvergne Station; Geology -- Northern Territory -- Auvergne Station; land resource assessment; land units; soil landscapes; vegetation communities
Northern Territory Government
204 pages ; colour photographs, maps, figures, tables ; 30 cm.
Attribution International 4.0 (CC BY 4.0)
Northern Territory Government
http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=E3F20A909A8123ADE040CD9B21446CC0; http://hdl.handle.net/10070/245323 [Land resources of the Victoria River District]
Land Resources of Auvergne Station A supplement to the Land Resources of the Victoria River District 67 10. Soil Erosion Fragile Landscapes and Implications for Management There are several fragile landscapes on Auvergne that warrant special mention. These areas are inherently vulnerable to disturbance due to physical and chemical soil properties, their position in the landscape and the human factors that can dramatically increase this risk. Some areas have been significantly impacted so it is important to recognise and understand the processes that influence the condition of these landscapes to help to mitigate the risks associated with erosion. Land unit 8l3A These units typically follow the Victoria, West and East Baines river systems. They are predominantly narrow plains, levees or backplains that exist either side of the rivers. The Pinkerton range on the west has a large influence on the susceptibility of these units to erosion. Significant surface water flow from these landscapes rapidly runs onto the relatively flat or gently sloping plains and is influential in transporting sediment and causing sheet and gully erosion. The soil has a very high K factor of 0.069 and very high levels of fine sand and silt through the profile (combined total of 83%). These soils are also extremely sodic (>30% ESP) and dispersive from 0.4 m. The surface horizons lack significant structure and are prone to becoming pulverulent (bull dusty). Once the subsoils are exposed they are easily dispersed and prone to forming surface crusting that dispels water and further exacerbates the soil to erosive processes. These areas are also favoured by stock due to their close proximity to water and pasture, particularly the sweet annual grasses that emerge during the Wet season. The open woodlands are also ideal shady resting places (Figure 10.1). These areas are naturally very susceptible to disturbance, but the compounding effects of grazing stock, increased fire frequency, rainfall and rainfall intensity all combine to significantly impact the soil. McCloskey et al. (2016) suggest the badland formations have probably been triggered by cattle grazing with the expansion aided by increased rainfall in the past 40 years. The exacerbation of flood drainage channels along parts of the Victoria River was probably initiated by cattle pads and the role of cattle as the geomorphic agent is well documented (Trimble and Mendel 1995 and McCloskey et al. 2016). Gully erosion has been long considered to be a major source of sediment in tropical rivers (McCloskey et al. 2016; Bartley et al. 2005, Olley and Wasson 2003; Rutherfurd 2000; Wasson et al. 2002). Once ground layer vegetation is lost these areas are exposed to significant runoff Figure 10.1 Cattle favour the areas along the river. Shade, feed and water are all in close proximity.
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